Post by thread:LCD Problem II

Hi all, Thanks for the quick help on the original problem, but now I have another. I can write to the first line of the LCD fine, but I can't find any way that lets me write to the second. If I try just sending more than 16 chars, the ones that come after 16 don't get printed. If I try to set the address register, the same thing happens. Apparently, I can't find the right address for the second line. Some body had suggested that the address for the first line was 0x80 and 0xC0 for the second. Well 0x80 works for the first line, but when I write to 0xC0, I get no output. I also tried 0xA0 and 0x90, and neither worked. Thanks in advance for your help, Sean +--------------------------------+ | Sean Breheny | | Amateur Radio Callsign: KA3YXM | | Electrical Engineering Student | +--------------------------------+ Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 spam_OUTshb7TakeThisOuTcornell.edu Phone(USA): (607) 253-0315 ICQ #: 3329174

At 07:30 PM 10/8/98 -0400, you wrote: >I can write to the first line of the LCD fine, but I can't find any way >that lets me write to the second. If I try just sending more than 16 chars, >the ones that come after 16 don't get printed. If I try to set the address >register, the same thing happens. Apparently, I can't find the right >address for the second line. Some body had suggested that the address for >the first line was 0x80 and 0xC0 for the second. Well 0x80 works for the >first line, but when I write to 0xC0, I get no output. I also tried 0xA0 >and 0x90, and neither worked. Sean, If it's a 16x1, $80 is the first 8, and $C0 starts the second 8. Are you certain you are senidn ghte $C0 properly, as an instruction and not as data? Ê Todd Peterson Ê E-Lab Digital Engineering, Inc. Ê (816) 257-9954 Ê Embedded Control & Integrated Circuit Solutions... <http://www.elabinc.com/>http://www.elabinc.com -> NEW: EDE702 OEM Serial to LCD Interface IC <- (Production Quantity version of our popular EDE700 IC)

Thanks to all who responded, I just figured it out. Just as Tony said, I had the second line turned off. I was actually setting it up for two line, but the next instruction after that was a "display on" which apparently resets the setting to single line. When I moved the instruction which set the bit to the position just AFTER the reset, it started working. Also, all of those who suggested the address 0xC0 were correct, that is the address for the second line, and it WON'T just go over to the second line, you must actually set the address, just as you all said. Thanks, Sean At 06:58 PM 10/8/98 -0600, you wrote: {Quote hidden}>At 07:30 PM 10/8/98 -0400, you wrote: > >>I can write to the first line of the LCD fine, but I can't find any way >>that lets me write to the second. If I try just sending more than 16 chars, >>the ones that come after 16 don't get printed. If I try to set the address >>register, the same thing happens. Apparently, I can't find the right >>address for the second line. Some body had suggested that the address for >>the first line was 0x80 and 0xC0 for the second. Well 0x80 works for the >>first line, but when I write to 0xC0, I get no output. I also tried 0xA0 >>and 0x90, and neither worked. > >Sean, > >If it's a 16x1, $80 is the first 8, and $C0 starts the second 8. > >Are you certain you are senidn ghte $C0 properly, as an instruction and not >as data? > > > >Ê Todd Peterson >Ê E-Lab Digital Engineering, Inc. >Ê (816) 257-9954 >Ê Embedded Control & Integrated Circuit Solutions... > <http://www.elabinc.com/>http://www.elabinc.com > >-> NEW: EDE702 OEM Serial to LCD Interface IC <- >(Production Quantity version of our popular EDE700 IC) > +--------------------------------+ | Sean Breheny | | Amateur Radio Callsign: KA3YXM | | Electrical Engineering Student | +--------------------------------+ Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 shb7KILLspamcornell.edu Phone(USA): (607) 253-0315 ICQ #: 3329174

> Van: Ralph Landry <rlandryspam_OUThaywood.main.nc.us> > Aan: @spam@PICLISTKILLspamMITVMA.MIT.EDU > Onderwerp: Re: LCD Problem II > Datum: vrijdag 9 oktober 1998 6:03 > > I believe that 0h is the first line and 40h is the second line, > although I can see where using 80h for the first line and > C0h for the second line would do the same as it appears > as bit 7 is getting lost in the bit bucket. wasn't bit 7 set to tell the LCD to do something with the cursor-position adres, and not with the re-definable characters ? I do not have the doc's here with me, so I can't verify it ... Greetz, Rudy Wieser